Dynamic Performance Evaluation of Bridge-Subgrade Transition of Shuohuang Railway

There are many bridge-subgrade transition sections along Shuohuang Railway line. When the train passing through the section, dynamic effects between trains and track will increase greatly, the track will be damaged and the trains' stability and safety will be impacted because of the stiffness difference in the junction between track and bridges. Based on the characteristics of Shuohuang Railway, a dynamic model is established to analyze the dynamic response rules under moving trains and the influence induced by stiffness of fastenings, surface layer of subgrade and fillers. According analysis, this paper proposed the strengthen schemes of subgrade surface layer by using graded broken stone and subgrade bottom layer by using tamping soil cement pile. The dynamic analysis of wheel/rail system shows that the strengthen measures can meet the requirements of dynamic performance. The research of this paper provides scientific basis for the design of bridge-subgrade transition section of heavy haul railway.